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After the screen has been off for a while, why am I not receiving mail and instant message notifications? Internet radio broadcast also stopped.

If your phone is running Android™ 7 or up and Power saver is turned on, you may experience the following:

Email, instant messaging, and other apps are not syncing or streaming data until you open them.

Except for the HTC Weather app, other apps that use location services do not update to show your current location.

Unable to use Google Maps™ Navigation.

Phone doesn't vibrate.

If you're experiencing the above, do one of the following:

Check your remaining battery power and the Power saver's selected battery level setting. If your phone's current battery level is still higher than that of the power saver's setting, turn off Power saver.

If you want to keep Power saver on, disable battery optimization in those apps that sync data, stream media, or use location services.

How do I turn off battery optimization in apps?

If there are apps that you don't want battery optimization enabled, you can turn the feature off in those apps.

Go to
Settings.

Do one of the following:

Android 8:
Tap
Battery, and then tap
> Battery optimization.

Android 6 or 7:
Tap
Power > Battery optimization.

Tap
Not optimized > All apps to see the complete list of apps.

To turn off battery optimization in an app, tap the app name, and then tap
Don't optimize > Done.

Repeat this process to turn off optimization in other apps.

To filter the list and see which apps have battery optimization disabled, tap
All apps > Not optimized.